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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c5ea99470b2eeb53bec37271b9bf2326b6d48ef414acc8b7cf1fb0a53bee01' 
  AND token = '6ZDZusq19z27+xSzxWTJtgzDnc3Emj7uWMQOLKnAj/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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