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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ee6c67a8c9b6faf8ed8803531f120b9e06a40215c180366337859fcbc763d0' 
  AND token = 'jyKdmdn1/lXKyIGmylZ03j8le0l/D36ZwFpmyi33+9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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