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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93e8448c5c24e1f399c3c95af243003873930c7a18c4858a3ea0a0eef6da563' 
  AND token = 'mRB7mrGTG6uA/IZXCtDDnZE945/m152rxZC447lhEvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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