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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e708c29855feb3c0ac2a5d2298ce3db21f525a0180f07aa5c16a073b360dd55' 
  AND token = '+OaOvNcOfrbfVI+B+5PkL9yCKZngJQ8wmpniSmQcoX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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