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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352c97eb345ffdc3bb49d492059a66f002514c43104dea7ae6dc9cc6f58e334f' 
  AND token = 'idTH4tXhOigljO0PlsBrBzGW+Jt7Sz0g9j37fFK2Sz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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