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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a26f8282cc3762801d18b40dfca40c9ff2a1181f6a17a04c243c242469b430' 
  AND token = 'BJY1UX7H8EfHbC6FTYwR5BF9IfLc/VfLJteuwfkPrx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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