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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f7b062febf0767758f0bb824e9ad17909c601af6ddde8af1bcdaa83e68ad82' 
  AND token = 'ssxOmWq/iSO0x91rgLW9CQozw+4AAGwd4fjXUSqL7yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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