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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaea6d4af9a202b5a14b45dac2f68650628a983ca935c2e451a2faf312e2f1e3' 
  AND token = 'BNbN8R5beMfR4iiB4pU4KHBO1RjWUbkZ5rv88Y0mpmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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