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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7355946086b27e5f973ea65228877dc42b97b5bf46ec28b3835b061dd6521b02' 
  AND token = 'rrS1e9xYF8QmuY2XnHcO8yFP3vGV0WTzPxhjlxzjA3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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