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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ca93d00a5e8815a3df0b3b0ac39e89372b43e1c8bcee9f101c7b2223f6b55f' 
  AND token = 'OsgEeNZ2+jKie4biIyHNUxcfKCAC52xgAYm+FxpV6dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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