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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578826fde93192e119e3408dc1a14f6199a48899c7ca6ba91e672a0f2eed6f7e' 
  AND token = 'Hv8cW60RRCR+KAzeDs4+bw+sC119SwzitQYcU+Y8d9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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