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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97e8ac4e95ec8d61592009d51c80ea6d48841f9be482b19452ea39f575eb6c2' 
  AND token = '1S19dBn/jNT0DWvg+Oey97LI81XAThVssC+ScBeY5ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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