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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3567deb058a0e2e213f56456928ddc08143aa7c139032dae9758e6b25b21c0' 
  AND token = 'ZxSHuAydirkRpVIjU0fG51YG3D06B6VJzppz8/+Rc2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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