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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf62a37e9065e28d2b890078abf49fd1e8589f5ad1bb94497297020881d93bf8' 
  AND token = 'yd1xFfBtpd2dI1/ZhOkTz5hztmiXg1DX4Rk3Lk76nSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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