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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcf6ab7f0b8f3e5e78267e70add4910fe69da21fb2bb5e3068f62b9c744ecea' 
  AND token = 'jaZaq2YsujKHeJE2rWjxfXWsxfODMnASUnpIO9Z0xpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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