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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a883fddf7183852192e12d85c5bdb7534847226736cf98a172aa53ccda67726c' 
  AND token = 'YxiPew/k7CFjxfbUj5QLZ7U+oalkTRgE90plgWvccVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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