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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f5533f356e79e43a895152ed1edaf7aaafe0f650f5124568a9b13ac8504260' 
  AND token = 'Gn1EaXky7j413Bt5hFdOzFnyQV5vLvSOYdA+/0p1Idg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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