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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74b430a57edb66b9a4f075f55317d509adcf62a5107de126c0809ed022c6e22' 
  AND token = 'VvP9IPin/HsxcrrFl7/VaYwdnvgnK4AK3Pc7A+wmEko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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