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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc39f8b43bbdc2ed4bea9b0c8732c79d54502fa476a0bdbbc84fa6ae1fc8e6dd' 
  AND token = '4B5PYi7qTFKZ0Pi/OChnoABq9pFbMLSz1Jpp/NLeaAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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