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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049c72de390bbd931135e0ff213777fc82b47b7d1b12d72b0afde5ae415f6b3e' 
  AND token = 'Q9OwXd+30WAmJALryR7QCt5QlZ2Zw5ySunbRTFn2n+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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