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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fe9b1d985b28f2d3006230443d22654538a63f25568b8de4602b66aaca1c17' 
  AND token = 'A6rz8r5ysTAYtg4eSh+ZGPaW9IahitwhUp66f6hZj08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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