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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f685b91b010f45a39dea736e79d62d96feb233e1eed8e35cb524f5e6bf81af7b' 
  AND token = 'IZ4f9o5XPiRgbGFCquVlWd81i6DACkoEhdnDir6IwBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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