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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b1c74b0b696be44c9c1fcdcff6fb86bb79b2cc791d915785b6c45d266ba0a4' 
  AND token = 'UelQGjhs4BHw9cRgA/H20kerHnXwvCxDnXKwISC5f8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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