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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c943a27da3e822a8f23b0a7f19460f149cb6e71d2060d33bccbb880f64f803f' 
  AND token = 'P1jEetzsAEKVu8H5obbNKpaAPyFTMn1H8MwTLoVo7as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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