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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35de197149136270f66dd432e932024ef0bc06f85d9c2a325f63e4e19c4309dd' 
  AND token = 'oNgBe7Ar/CtCRBjXYmqAo0qcBhycPos1ZbfnI+NT/Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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