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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0544faffae8a136d9eacfade74f4cc3f137180d2670cbfc52e9d1dfddd794794' 
  AND token = '4xenlV2AWWn3rL4n3HutdHm2WHsWZIvf4Uv9b0FEjw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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