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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32e36ded3ad7d7584e9458c94eff074ec75db58bcf048392d3c587e055f5454' 
  AND token = 'MQK6y71QkiZztWKtguFpsm1GnBoIvJLy+QImhNJ9usk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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