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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94efebde61d59b8d17dd479b2a2ac7c268b05d8bc561bf60154b65061fe60335' 
  AND token = 'TwGQrg0MXpq/r6h2oNmoxmB/Ns+c7zUWEG6bqd2zUyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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