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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d3d0febcb99171719e1eeedac1eee0c8544f3cb3805243820e6f27883e9997' 
  AND token = '+iYzbO+/pSTNvhg2cs56/ERDxRm9frjeBgDS5wT2XwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00484

JSON explain

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