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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68340fc6a382cb34a4daae11f79404c4b840de2810c421f6eea9f4701095fce0' 
  AND token = 'DOngVSK//TVG2M2ePf6659iebSYbZO4WFPKGTp85GvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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