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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da761e221bfab53d970f4e9f9ceee4db0275804214e537864570cf8f0fe427ae' 
  AND token = '7oUv+FJFHypNAGwVg9Sy4K5HLW3Xz30W+LDtiCDcZKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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