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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad033775dce9882a178d46d93613c47724157eb65ea95fb1165293a0349ffcd' 
  AND token = 'QzT6dkaV2MqUylUzSvOM4gxjPsd5BOar7Jvn4SFDHys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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