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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93c06875f49add8ae43441529e828dd84ba1d40d2576ffe6622a24d16b52a30' 
  AND token = 'xjtHBPK9hIS1H5PV3v1TxecKbWO3dRqxif1+GtHV3E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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