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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90df22dd9162c0a8f07619da9e9487bce9c120e17f8e174b361a133e72325f9' 
  AND token = 'TaxocjJceTQCspDEKE+J8yMuQOVuk3qevjtQ7R40dIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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