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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfabf6d87af7e683d34ae13e44fe89094124300e6a3017199c3064e2675c1819' 
  AND token = 'qP46xpFoAR3MmJdNOaD4EVclZteMJ8eWUNPIII8OSjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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