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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b617e166082c168b4717fd899d6a843d0e64ccb2aac819335f2f6b9eaabd3a01' 
  AND token = 'uVGCuJrF7rEE3dZvy3vwXizeIwq9RZxaTIq+a37wA1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}