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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8fdec5146e8cb8338205682662d0a3357e6b0e992931c246cebc93c15f778c' 
  AND token = 'kHjBXi7Lz4ROokcIsEId698iWrDghz4bBCUGnonTuT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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