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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1feb07fa804e19af041818b0210864d51912c10fcd4047e8117a04952f5c50e' 
  AND token = '0SmfcU+aaZ97S5w0B8y71/yFtsROACcbXHRI9Wswhyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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