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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8839e9c6053f942841431464d73bd58029a54eed09f7aceed51cc4a297b80705' 
  AND token = '5n8AaWNzdiLIf6z8oQcPYIm8fiKi1VWPHkKgnN+1pmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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