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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ca5463293133c98b66070764c7394529915619f0d3d9e644a62d6c8bceb980' 
  AND token = 'brR3BS6I3czaT6p0KEt/RFSHKA6iZPajoyD67kSDSBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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