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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7a68d84b536c0b233f53e76272f469d918e6d1ffa51b410e7e806fffff9361' 
  AND token = 'tz+ArEwbf7zBQo2d0FTLu5dDvJJOEPwbT09I0PjN5Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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