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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d023eb333c9f4e9a33ba316b8fb0a8d77322955179d225e8154d31a8dd2eda' 
  AND token = 'CfRERajAyd3/slzQp95tCr4CmaVYM7cTZ6Em+kOM1wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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