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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e265033559bece1addc39268f58eba813c7ad356035c2434b84d8851ef3de39a' 
  AND token = 'ECNbnCj8ds4+FDC9YhA/M4I03XfxDI+LXF5gAXivdfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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