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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a05b701887e88c014311d10dcd84f5c9b0d6c6814111b4a2a443cf9cc28e63' 
  AND token = 'XLMWtmxl3yAgSzsb0K9xSHxjju31nwoMulrzZAQ5muo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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