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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6305dc5e4c952d8da9c50622cf0ef59599758dc43bbc5db76a69aa0d6ecf11' 
  AND token = 'ANF/F2yOGLWgsPz/XDKW1B/2rjExNyzGI1K7nS8CKBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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