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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7647ed5d1678797ba0191d6448795f7ddb75e09778af7426bc9b2aaea57dbd0e' 
  AND token = 'xBLOa1gX9zbghOQO/Ag1SF4L4IeJDHqx+M/n7hfCCtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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