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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523df1d5e19a1784516842871fc319f1df545f97c2b95a4cd3499075dec37e43' 
  AND token = '4KEV+oxUISeUBTBtd8gxRPOcY1jmxz4TG8GGnga17L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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