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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd30ddb0810cdf2f0597e9d55e1d543d9d716a2aec6ec5949b77bb8a7dee23c' 
  AND token = 'bQ8LUaWr4OephTF9AfxRNOwo8ST8isQ2WNG9xNSNdnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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