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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b697703e93ecbbd765b80c2d2dcba6e9f13d177f1b0b7ff96cf0fcf19b9f9b' 
  AND token = 'uKpZAG2TdpTTkDb+cfzdO5diMv3oZrsF1t8kUuZd+ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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