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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8cbc9e43c179c4596057eda48931b70fce55e1e94056338ec0d045e989e15d1' 
  AND token = 'RsHIxm/hDljedetYMX27HeH8ZCk3AsJkkUpSRn73Yc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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