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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f56c964682c511c778a913d25454ce6b83cbec5004ba5cc2f4a52d131ea1c52' 
  AND token = '4DbCHFiHPSTvTOFLFca6li3brZr1ZdrXq/8SHYMvlTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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