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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0115692507f8c7c76fc22cc8138579d224c1bcaf1ad02332c5731f6404a203b3' 
  AND token = 'HVDaQqTUZRO6eMqUoiG2iM/sIKU8IerwQiYR43VNRBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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